Selective Pallet racking is by far the most common type of warehouse storage rack and is what is typically thought of when the need arises for industrial type storage racking. All selective rack is made from component pieces that are usually priced & purchased seperately.

Uprights (also called Frames, or less commonly, legs) are the support columns that hold up individual shelves in a section of rack. Pallet Rack uprights form the ends of what are commonly known as 'bays' of pallet racking. Each pallet rack bay must have at least two uprights, however if multiple bays will be placed in a row they may share uprights

Beams are used to create the actual 'shelf levels' that support loads and are held up by pallet rack uprights. Pairs of beams form each individual shelf level (see figure 1). Shelf capacity is determined by the height of the beam, length of the beam and the number of shelves per bay. Most modern beams feature end clips that attach directly to the upright without the use of specialized hardware, however there are many different brands available that feature unique designs